#!/bin/sh
#

set -e

if [ $# -ne 1 ]; then
	echo "usage: sh $0 include-dir"
	exit 1
fi

includedir="$1"

LC_ALL=C; export LC_ALL

# Build a list of headers that have ioctls in them.
# XXX should we use an ANSI cpp?
ioctl_includes=$(
	cd $includedir
	set -e
	# if /bin/sh is bash this will avoid further errors due to missing commands
	if set -o | grep -q pipefail; then
		set -o pipefail
	fi

	filter='tee'
	if [ "${MK_PF}" = "no" ]; then
		filter='egrep -v (net/pfvar|net/if_pfsync)\.h'
	fi
	# find -s would avoid the need to invoke sort but it is non-portable
	find -L ./* -type f -name '*.h' | \
		LC_ALL=C sort | \
		$filter | \
		xargs egrep -l \
'^#[ 	]*define[ 	]+[A-Za-z_][A-Za-z0-9_]*[ 	]+_IO[^a-z0-9_]' |
		awk '{printf("#include <%s>\\n", $1)}'
)

if [ -z "$ioctl_includes" ]; then
	echo "Failed to build list of ioctl headers"
	exit 1
fi

awk -v x="$ioctl_includes" 'BEGIN {print x}' |
	$CPP -nostdinc -I$includedir -dM -DCOMPAT_43TTY - |
	awk -v ioctl_includes="$ioctl_includes" '
BEGIN {
	print "/* XXX obnoxious prerequisites. */"
	print "#define COMPAT_43"
	print "#define COMPAT_43TTY"
	print "#include <sys/param.h>"
	print "#include <sys/devicestat.h>"
	print "#include <sys/disklabel.h>"
	print "#include <sys/mman.h>"
	print "#include <sys/socket.h>"
	print "#include <sys/time.h>"
	print "#include <sys/tty.h>"
	print "#include <bsm/audit.h>"
	print "#include <net/ethernet.h>"
	print "#include <net/if.h>"
	print "#ifdef PF"
	print "#include <net/pfvar.h>"
	print "#include <net/if_pfsync.h>"
	print "#endif"
	print "#include <net/route.h>"
	print "#include <netinet/in.h>"
	print "#include <netinet/ip_mroute.h>"
	print "#include <netinet6/in6_var.h>"
	print "#include <netinet6/nd6.h>"
	print "#include <netinet6/ip6_mroute.h>"
	print "#include <stdio.h>"
	print "#include <cam/cam.h>"
	print "#include <cam/scsi/scsi_pass.h>"
	print "#include <stdbool.h>"
	print "#include <stddef.h>"
	print "#include <stdint.h>"
	print "#include <sysdecode.h>"
	print ""
	print ioctl_includes
	print ""
	print "const char *"
	print "sysdecode_ioctlname(unsigned long val)"
	print "{"
	print "\tconst char *str = NULL;"
	print ""
}

/^#[ 	]*define[ 	]+[A-Za-z_][A-Za-z0-9_]*[ 	]+_IO/ {

	# find where the name starts
	for (i = 1; i <= NF; i++)
		if ($i ~ /define/)
			break;
	++i;
	#
	printf("\t");
	if (n++ > 0)
		printf("else ");
	printf("if (val == %s)\n", $i);
	printf("\t\tstr = \"%s\";\n", $i);
}
END {
	print ""
	print "\treturn (str);"
	print "}"
}
'
